Heat Pumps - Analysis and key findings. A report by the International Energy Agency.
Air-to-air heat pumps have been rapidly becoming more widespread in recent years and now dominate global heat pump sales for new buildings. In the United States, for example, annual shipments expanded from 2.3 million units in 2015 to 3.4 million in 2020, with the growth rate in 2020 unchanged from previous years. Several factors have raised the popularity of air-to-air heat pump technologies, including policy development, upgraded construction standards that make heat pumps in new buildings more competitive, and growing air-conditioning demand. Sales of heat pump water heaters (for sanitary hot water production) have more than tripled since 2010, largely owing to purchases in China. Japan is the…